#include <iostream>

using namespace std;

int n;

int main()
{
	cin >> n;
	int delta = 1 + 4 * 2 * n;
	int x = ceil((sqrt(delta) - 1) / 2);
	cout << x << endl;
	for (int i = 1; i <= x; i++)
	{
		cout << i << " ";
	}

	return 0;
}